Is it possible Animate the Compositor node parameters?
Of course. As (almost) everywhere in blender:


Insert a keyframe by placing the cursor over a property and press I
Move to a different frame in the timeline
Set the property to the desired value
Press I again for a second keyframe on this property




Alternatively, you can just right click on (almost) any property and choose Insert Keyframe:



Dopesheet &amp; Graph Editor:



Alt+I removes a single keyframe, Alt+Shift+I removes all keyframes of a property.